Starting with one of the last Tumbleweed snaphopts up to the actual one (20191018), I get various udev rule error messages in my log.
A few has been fixed already, but the following ones still show up:

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/usr/lib/udev/rules.d/61-persistent-storage-compat.rules:83 Invalid value "/bin/sh -c 'eui="%s{eui}"; echo ${eui// /}" for PROGRAM (char 33: invalid substitution type), ignoring, but please fix it.
 /usr/lib/udev/rules.d/61-persistent-storage-compat.rules:86 Invalid value "/bin/sh -c 'nguid="%s{nguid}"; echo ${nguid//-/}" for PROGRAM (char 37: invalid substitution type), ignoring, but please fix it.
 /usr/lib/udev/rules.d/61-persistent-storage-compat.rules:95 Invalid value "/bin/sh -c ' cd /sys/%p; while ! [ -f model ]; do cd ..; [ $(pwd) = %S ] && exit 1; done; cut -c 1-16 model'" for PROGRAM (char 60: invalid substitution type), ignoring, but please fix it.
 Configuration file /etc/udev/rules.d/79-udev-epson.rules is marked executable. Please remove executable permission bits. Proceeding anyway.
 /usr/lib/udev/rules.d/80-hotplug-cpu-mem.rules:24 Invalid value "/bin/sh -c ' while read src dst fs opts unused; do case $fs in tmpfs)  mount -o remount "$dst" ;; esac done </proc/self/mounts" for RUN (char 57: invalid substitution type), ignoring, but please fix it.
 /usr/lib/udev/rules.d/84-nm-drivers.rules:10 Invalid value "/bin/sh -c 'ethtool -i $1 | sed -n s/^driver:\ //p' -- $env{INTERFACE}" for PROGRAM (char 24: invalid substitution type), ignoring, but please fix it.
 /usr/lib/udev/rules.d/90-libgpod.rules:19 IMPORT key takes '==' or '!=' operator, assuming '==', but please fix it.
 /usr/lib/udev/rules.d/90-libgpod.rules:23 IMPORT key takes '==' or '!=' operator, assuming '==', but please fix it.
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